618332168281 has 9 divisors (see below), whose sum is σ = 633081019701. Its totient is φ = 603919324092.

The previous prime is 618332168273. The next prime is 618332168371. The reversal of 618332168281 is 182861233816.

It is a happy number.

The square root of 618332168281 is 786341.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 618332168281 - 2³ = 618332168273 is a prime.

It is a super-2 number, since 2×618332168281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618332108281) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 33803520 + ... + 33821806.

Almost surely, 2^618332168281 is an apocalyptic number.

618332168281 is the 786341-st square number.

618332168281 is the 393171-st centered octagonal number.

It is an amenable number.

618332168281 is a deficient number, since it is larger than the sum of its proper divisors (14748851420).

618332168281 is an frugal number, since it uses more digits than its factorization.

618332168281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36660 (or 18330 counting only the distinct ones).

The product of its digits is 663552, while the sum is 49.

Multiplying 618332168281 by its sum of digits (49), we get a square (30298276245769 = 5504387²).

The spelling of 618332168281 in words is "six hundred eighteen billion, three hundred thirty-two million, one hundred sixty-eight thousand, two hundred eighty-one".